package com.mitdy.sg.common.utils;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.dozer.DozerBeanMapper;

/**
 * JavaBean and map converter.
 */
public final class BeanMapUtils {

    private static DozerBeanMapper dozer = new DozerBeanMapper();
    
    /**
     * Converts a map to a JavaBean.
     *
     * @param type
     *            type to convert
     * @param map
     *            map to convert
     * @return JavaBean converted
     * @throws IntrospectionException
     *             failed to get class fields
     * @throws IllegalAccessException
     *             failed to instant JavaBean
     * @throws InstantiationException
     *             failed to instant JavaBean
     * @throws InvocationTargetException
     *             failed to call setters
     */
    public static final Object toBean(Class<?> type, Map<String, ? extends Object> map)
            throws IntrospectionException, IllegalAccessException, InstantiationException, InvocationTargetException {
        BeanInfo beanInfo = Introspector.getBeanInfo(type);
        Object obj = type.newInstance();
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
        for (int i = 0; i < propertyDescriptors.length; i++) {
            PropertyDescriptor descriptor = propertyDescriptors[i];
            String propertyName = descriptor.getName();
            if (map.containsKey(propertyName)) {
                Object value = map.get(propertyName);
                Object[] args = new Object[1];
                args[0] = value;
                descriptor.getWriteMethod().invoke(obj, args);
            }
        }
        return obj;
    }

    public static final Object toBean2(Class<?> type, Map<String, ? extends Object> map)
            throws IntrospectionException, IllegalAccessException, InstantiationException, InvocationTargetException {
        BeanInfo beanInfo = Introspector.getBeanInfo(type);
        Object obj = type.newInstance();
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
        for (int i = 0; i < propertyDescriptors.length; i++) {
            PropertyDescriptor descriptor = propertyDescriptors[i];
            String propertyName = descriptor.getName();
            if (map.containsKey(propertyName)) {
                Object value = map.get(propertyName);
                Object[] args = new Object[1];
                args[0] = value;
                try {
                    descriptor.getWriteMethod().invoke(obj, args);
                } catch (IllegalArgumentException e) {

                }
            }
        }
        return obj;
    }

    /**
     * Converts a JavaBean to a map.
     *
     * @param bean
     *            JavaBean to convert
     * @return map converted
     * @throws IntrospectionException
     *             failed to get class fields
     * @throws IllegalAccessException
     *             failed to instant JavaBean
     * @throws InvocationTargetException
     *             failed to call setters
     */
    public static final Map<String, Object> toMap(Object bean)
            throws IntrospectionException, IllegalAccessException, InvocationTargetException {
        Map<String, Object> returnMap = new HashMap<String, Object>();
        BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass());
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
        for (int i = 0; i < propertyDescriptors.length; i++) {
            PropertyDescriptor descriptor = propertyDescriptors[i];
            String propertyName = descriptor.getName();
            if (!(propertyName.equals("class") || propertyName.equals("declaringClass"))) {
                Method readMethod = descriptor.getReadMethod();
                Object result = readMethod.invoke(bean, new Object[0]);
                if (result != null) {
                    returnMap.put(propertyName, result);
                } else {
                    returnMap.put(propertyName, "");
                }
            }
        }
        return returnMap;
    }

    public static final Map<String, Object> toMapIgnoreEmptyField(Object bean)
            throws IntrospectionException, IllegalAccessException, InvocationTargetException {
        Map<String, Object> returnMap = new HashMap<String, Object>();
        BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass());
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
        for (int i = 0; i < propertyDescriptors.length; i++) {
            PropertyDescriptor descriptor = propertyDescriptors[i];
            String propertyName = descriptor.getName();
            if (!(propertyName.equals("class") || propertyName.equals("declaringClass"))) {
                Method readMethod = descriptor.getReadMethod();
                Object result = readMethod.invoke(bean, new Object[0]);
                if (result != null && result.toString().length() > 0) {
                    if (String.class.equals(result.getClass())) {
                        String str = (String) result;
                        if (StringUtils.isNotEmpty(str)) {
                            returnMap.put(propertyName, result);
                        }
                    } else {
                        returnMap.put(propertyName, result);
                    }
                }
            }
        }
        return returnMap;
    }

    /**
     * 拷贝实体，source,target不允许为空
     *
     * @param source
     * @param target
     */
    public static void copyProperties(Object source, Object target) {
        dozer.map(source, target);
    }
    
    public static <T> T copyProperties(Object source, Class<T> destinationClass) {
        return dozer.map(source, destinationClass);
    }


    /**
     * 拷贝实体集合，sourceList，targetList不允许为空
     *
     * @param sourceList
     * @param targetList
     */
    public static <T> List<T> copyList(Collection<?> sourceList, Class<T> destinationClass) {
        List<T> destinationList = new ArrayList<>();
        for (Object sourceObject : sourceList) {
            T destinationObject = dozer.map(sourceObject, destinationClass);
            destinationList.add(destinationObject);
        }
        return destinationList;
    }



    /**
     * Map --> Bean 2: 利用org.apache.commons.beanutils 工具类实现 Map --> Bean
     *
     * @param map
     * @param obj
     */
    public static void transMap2Bean2(Map<String, Object> map, Object obj) throws InvocationTargetException, IllegalAccessException {
        if (map == null || obj == null) {
            return;
        }
        org.apache.commons.beanutils.BeanUtils.populate(obj, map);
    }

    /**
     * Map --> Bean 1: 利用Introspector,PropertyDescriptor实现 Map --> Bean
     *
     * @param map
     * @param obj
     */
    public static void transMap2Bean(Map<String, Object> map, Object obj) throws IntrospectionException, InvocationTargetException, IllegalAccessException {
        BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();

        for (PropertyDescriptor property : propertyDescriptors) {
            String key = property.getName();
            if (map.containsKey(key)) {
                Object value = map.get(key);
                // 得到property对应的setter方法
                Method setter = property.getWriteMethod();
                setter.invoke(obj, value);
            }
        }
    }

    /**
     * Bean --> Map 1: 利用Introspector和PropertyDescriptor 将Bean --> Map
     *
     * @param obj
     */
    public static Map<String, Object> transBean2Map(Object obj) throws IntrospectionException, InvocationTargetException, IllegalAccessException {

        if (obj == null) {
            return null;
        }
        Map<String, Object> map = new HashMap<String, Object>();
        BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
        for (PropertyDescriptor property : propertyDescriptors) {
            String key = property.getName();

            // 过滤class属性
            if (!key.equals("class")) {
                // 得到property对应的getter方法
                Method getter = property.getReadMethod();
                Object value = getter.invoke(obj);

                map.put(key, value);
            }

        }
        return map;
    }
}